How to calculate each other's birthdays

First take out a calculator for MM (also in the mobile phone).

Then ask MM to enter her birthday month, such as June.

Then multiply it by 4.

Add 9 to the result.

The resulting number is multiplied by 25.

Finally, add the date, such as the 25th.

Finally, the number displayed on the calculator tells her to tell you, so you can know her birthday.

If you are familiar with the constellation, you can still sell it ~ ~

X belongs to 1, 12.

25 (4x+9)+y=z

100x+225+y=z

100x+y=z+225

Z+225 is known and assumed to be 12 16.

65438+February 65438+Born on June 6th

Suppose it's 923.

Born on September 23rd.